模拟电子技术基础（西安邮电大学） 第十二章_智慧树知到答案2021年

第十二章 POWER AMPLIFIERS：介绍功率放大器的工作原理参数选择。12.1功放的特点和分类:本节以分析功率放大电路的输出功率、效率和非线性失真为主，介绍功率放大器的分类，要求掌握甲类、乙类、甲乙类的概念。
12.2B类功率放大器的工作原理和参数计算:本节讲解B类互补对称放大电路的工作原理和参数计算，最后，介绍选择功率管的要求。
12.3AB类功率放大器及OTL电路与本章总结:本节主要介绍了功率放大器的几个参数之间的关系，本对本章进行了总结。

[单选题]The maximum theoretical efficiency of an RC-coupled class A amplifier is （    ）.

选项:[50%, 99% , 25%, 78.5%]
[判断题]Power amplifiers are typically used to drive low impedance loads.（     ）

选项:[对, 错]
[单选题]A class B amplifier (not push-pull) （     ）.

选项:[conducts through 180° of the input waveform, conducts through 360° of the input waveform, conducts between 180° and 360° degrees of the input waveform, depending on the amount of dc bias, conducts through less than 180° of the input waveform]
[单选题]Crossover distortion in class B amplifiers is prevented by （    ）.  

选项:[using complementary-symmetry transistors, increasing the load resistance, biasing the transistors deeply into cutoff, biasing the transistors slightly above cutoff]
[判断题]The power that an amplifier delivers to a load is equal to the difference between the power that the circuit draws from the power supply and the power that the circuit dissipates.（     ）

选项:[对, 错]